Enantioselective formal [2+2] cycloaddition of ketenes with nitroso compounds catalyzed by N-heterocyclic carbenes
作者:Tong Wang、Xue-Liang Huang、Song Ye
DOI:10.1039/c0ob00249f
日期:——
Chiral N-heterocyclic carbenes were found to be efficient catalysts for the formal [2+2] cycloaddition reaction of alkyl(aryl)ketenes and nitroso compounds to give the corresponding 1,2-oxazetidin-3-ones in moderate to good yields with high enantioselectivities. Reductive ring-opening of the oxazetidinones give the corresponding α-hydroxy acid derivatives in good yields.
发现手性N-杂环卡宾是有效的催化剂,用于烷基(芳基)乙烯酮和亚硝基化合物的正式[2 + 2]环加成反应,以中等至良好的收率,高收率得到相应的1,2-氧杂az啶-3-酮对映选择性。恶唑烷二酮的还原性开环给出相应的α-羟酸 衍生品收益率高。